/drivers/media/video/bt8xx/bttv-gpio.c
C | 187 lines | 119 code | 30 blank | 38 comment | 7 complexity | 4202b56eb13702460070f337a6855725 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
- /*
- bttv-gpio.c -- gpio sub drivers
- sysfs-based sub driver interface for bttv
- mainly intended for gpio access
- Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
- & Marcus Metzler (mocm@thp.uni-koeln.de)
- (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/delay.h>
- #include <linux/device.h>
- #include <linux/slab.h>
- #include <asm/io.h>
- #include "bttvp.h"
- /* ----------------------------------------------------------------------- */
- /* internal: the bttv "bus" */
- static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
- {
- struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
- int len = strlen(sub->wanted);
- if (0 == strncmp(dev_name(dev), sub->wanted, len))
- return 1;
- return 0;
- }
- static int bttv_sub_probe(struct device *dev)
- {
- struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
- struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
- return sub->probe ? sub->probe(sdev) : -ENODEV;
- }
- static int bttv_sub_remove(struct device *dev)
- {
- struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
- struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
- if (sub->remove)
- sub->remove(sdev);
- return 0;
- }
- struct bus_type bttv_sub_bus_type = {
- .name = "bttv-sub",
- .match = &bttv_sub_bus_match,
- .probe = bttv_sub_probe,
- .remove = bttv_sub_remove,
- };
- static void release_sub_device(struct device *dev)
- {
- struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
- kfree(sub);
- }
- int bttv_sub_add_device(struct bttv_core *core, char *name)
- {
- struct bttv_sub_device *sub;
- int err;
- sub = kzalloc(sizeof(*sub),GFP_KERNEL);
- if (NULL == sub)
- return -ENOMEM;
- sub->core = core;
- sub->dev.parent = &core->pci->dev;
- sub->dev.bus = &bttv_sub_bus_type;
- sub->dev.release = release_sub_device;
- dev_set_name(&sub->dev, "%s%d", name, core->nr);
- err = device_register(&sub->dev);
- if (0 != err) {
- kfree(sub);
- return err;
- }
- printk("bttv%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev));
- list_add_tail(&sub->list,&core->subs);
- return 0;
- }
- int bttv_sub_del_devices(struct bttv_core *core)
- {
- struct bttv_sub_device *sub, *save;
- list_for_each_entry_safe(sub, save, &core->subs, list) {
- list_del(&sub->list);
- device_unregister(&sub->dev);
- }
- return 0;
- }
- /* ----------------------------------------------------------------------- */
- /* external: sub-driver register/unregister */
- int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
- {
- sub->drv.bus = &bttv_sub_bus_type;
- snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
- return driver_register(&sub->drv);
- }
- EXPORT_SYMBOL(bttv_sub_register);
- int bttv_sub_unregister(struct bttv_sub_driver *sub)
- {
- driver_unregister(&sub->drv);
- return 0;
- }
- EXPORT_SYMBOL(bttv_sub_unregister);
- /* ----------------------------------------------------------------------- */
- /* external: gpio access functions */
- void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
- {
- struct bttv *btv = container_of(core, struct bttv, c);
- unsigned long flags;
- u32 data;
- spin_lock_irqsave(&btv->gpio_lock,flags);
- data = btread(BT848_GPIO_OUT_EN);
- data = data & ~mask;
- data = data | (mask & outbits);
- btwrite(data,BT848_GPIO_OUT_EN);
- spin_unlock_irqrestore(&btv->gpio_lock,flags);
- }
- u32 bttv_gpio_read(struct bttv_core *core)
- {
- struct bttv *btv = container_of(core, struct bttv, c);
- u32 value;
- value = btread(BT848_GPIO_DATA);
- return value;
- }
- void bttv_gpio_write(struct bttv_core *core, u32 value)
- {
- struct bttv *btv = container_of(core, struct bttv, c);
- btwrite(value,BT848_GPIO_DATA);
- }
- void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
- {
- struct bttv *btv = container_of(core, struct bttv, c);
- unsigned long flags;
- u32 data;
- spin_lock_irqsave(&btv->gpio_lock,flags);
- data = btread(BT848_GPIO_DATA);
- data = data & ~mask;
- data = data | (mask & bits);
- btwrite(data,BT848_GPIO_DATA);
- spin_unlock_irqrestore(&btv->gpio_lock,flags);
- }
- /*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */